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“I do not believe that (valmikis) they have been doing this job just to sustain their livelihood. Had this been so, they would not have continued with this type of job generation after generation.” And adds, “At some point of time, somebody must have got the enlightenment that it is their (Valmikis’) duty to work for the happiness of the entire society and the Gods; that they have to do this job bestowed upon them by Gods; and that this job of cleaning up should continue as an internal spiritual activity for centuries. This should have continued generation after generation. It is impossible believe that their ancestors did not have the choice of adopting any other work or business.”[ref]

Most Indian groups descend from a mixture of two genetically divergent populations: Ancestral North Indians (ANI) related to Central Asians, Middle Easterners, Caucasians, and Europeans; and Ancestral South Indians (ASI) not closely related to groups outside the subcontinent. The date of mixture is unknown but has implications for understanding Indian history. We report genome-wide data from 73 groups from the Indian subcontinent and analyze linkage disequilibrium to estimate ANI-ASI mixture dates ranging from about 1,900 to 4,200 years ago. In a subset of groups, 100% of the mixture is consistent with having occurred during this period. These results show that India experienced a demographic transformation several thousand years ago, from a region in which major population mixture was common to one in which mixture even between closely related groups became rare because of a shift to endogamy.